Define "best". There are many variables to consider.
Personally I like Nalini bibshorts. They are the most comfortable that I have used. They have an old fashioned simple chamois but it works very well. They are very stretchy so they don't become too tight around the thighs and i appreciate them not being too tight in the crotch area. They're not that expensive either and come in great team colours.
On the down side their lightweight fabric makes them not so durable compared to others but overall I like them a lot.
Regards, Anthony